罕遇地震作用下带转换层框筒结构的耗能研究

ENERGY DISSIPATION OF REINFORCED CONCRETE FRAME-TUBE STRUCTURES WITH TRANSFER STORIES UNDER STRONG EARTHQUAKE

通过能量法研究了带转换层框筒结构的弹塑性层间位移求解。通过转换层分别设置在第4层和第8层及不设转换层的3个钢筋混凝土框筒结构实例，用振型分解法按等效单自由度体系分别求解其滞回输入能；用pushover法分析了滞回耗能在层间的分布规律，与非线性动力时程需要选取地震波的不确定性相比，采用该法可以减少分析时间，同时获得较为稳定的分析结果；根据楼层滞回耗能与弹塑性层间位移的关系求出了各层的弹塑性位移。以上过程通过与非线性动力时程分析的对比，证明了方法的可行性。通过对2个设置转换层的结构改变相关参数后的研究表明，进行高位转换的结构采用相应的结构措施，可以有效地控制其在罕遇地震下的层间弹塑性变形。

The inelastic story drifts computation of reinforced concrete frame-tube structures with transfer story based on energy concept was performed in this paper. Three examples, two with transfer story at the fourth and the eighth story respectively and the third without transfer story, were analyzed. Equivalent single-degree-of-freedom（SDOF） systems were used to estimate the hysteretic energy demands of the frame-tube structures in order to simplify the computational effort. Pushover analysis was used to get the distribution of hysteretic energy in each story, comparison with nonlinear dynamic analysis found that this method can reduce the time of analysis as well as get more stable resuh. The relationship between hysteretic energy and inelastic story drift was used to get the inelastic story drift which can he used to check the inelastic deformation of weak story. The resuhs had been compared with nonlinear time-history dynamic analysis and the comparison was found to he good. After the adjustment of some parameters related to the two concrete frame-tube structures with transfer story, it showed that the inelastic story drift can he effectively controlled if relative measures had been adopted.